is it possible to exclude certain IPs or protocols from the VPN? I want to set up tomato as client to connect to my VPN server, but I'd like to exclude my file server from it as I don't want to strain the VPN with my torrent downloads. Can I somehow have the router connect to the VPN and tunnel all connections through it, except for the file server? Or alternatively exclude all torrent connections?

Alternatively it would also work for me if I could separate the VPN between Wifi and Ethernet, so that only the Wifi connections get routed through the VPN and the Ethernet connection go out directly.

You can use iptables and routes to get this done. Routes can redirect traffic from your wifi to the vpn. Iptables can be used to block certain ips/protocols from connecting. if you use PREROUTE with a protocol it and DNAT or SNAT you can send just those protocols to a certain ip. Google is your friend to find the right combination that works for you.

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